Multiple-spark plug



. L. NELSGN AND LPRNC.

MULHPE SPARK FWG. wmp/mou min, fsa. :9) :927.

Aifm-@med Jan... 6, 1920.

liltlltll@ @Teil einen s 50H1@ L. NILSN AND JHN PRINCE, OF CHICAGOELLENS MULTPLE-SPARK PLUG;

igsiefieev.

Specification of Letters Patentr Patented en il,

v lppliceton filed February 1u, 1917. Serial I'o. llflt.

To all 'whom it may concern.'

lle it known that We, Jeux L. NiLeoN :ind JOHN PRINCE, citizens ofthe United States, residing in the city of Chicago, county o'if' Cook, and Stute of illinois, lieve invented certain neW and useful liiiprovenients in Multiple-Spark Plugs, ol' which the followi ing is .e speciicetion.

Our invention relates to spark plugs for internal combustion engines, and has pan ticulei' reference to constructions wherein several spark gaps are provided. ln the present invention the two are arranged :it the inner, or explosion, end et the plug,

:ind the object of the invention is to provide ivlint ning' .be termed tlie stepping stone electrode, with e inininiunieinount of motel, or lieati'eteinixig materiel, and te provide :i mounting of said electrode Wliieli is e Safeguard against breakage of the porcelain core oi" insulating' materiel on which it is placed,

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center Wii'eor electrode 3*- pnesee. The

core 2 is shown held in e ugual cylindrical. and three-ded: gecliet or portion d with tire eid of e bushing end pecking; 5. The eide and in tire usuel manner, out is limited to e Straight piece of Wire instead ueiiel elboiv forni with e leg' directed toward the tip ofvtlie electrode. in the Space between tlie wires and i' tivo spark gaps 8 iand 9 are seperaitedby .eifshort section of Wire,J

` plug, ordouble-headed und pointed rivet l0 that is 4lield in e bore 11 mede et one side end :it tlie tip of tlie porcelain core 2,; shown in the two views.. The bore ll may be mede large enough to prevent crowding of ite rivet or intermediate electrode when en punded loy lient. This forno and method oit mounting of the intermediate electrode ob- .vietes retention in the inteiine'diete electrode of sufficient heat to cause untiined, intermef.

diete or accidental ignitions'oi the exploiive compound :ind eil'ects n eubstentiel saving in the amount oit' metal required for its corr struction. This' 'singlepoint intermediate electrode muy also loe otherwise mounted and arranged without departing from the spirit oty our invention.

ljlzwing thus described'our invention, we claim es nonv :ind desire to secure by Lettere Petent l. in e, spark plug?, tiie combination with vits metallic jacket end en insulating corev constructed and arranged with between gzip bore witliin seid core but open to the e. spark gap Seid core und jacket and e spark I exterior of tlie plug zuid to the gases to be i ignited, of an electrode Wire having its ignition end in said bore, end en interineclizite electrode piercing tlie Well ci Seid leere and providing en intensifying speri; gen ieetween seid Wire and seid jeclret, tl'ie latter I serving es the ground electrode 2. ln e sperli plug, tlie conilinetiontvitli 'ai .metallic eliell or jacket, of electrode Wire having its ignition end spaced epert from the Welle et sind shell or picket and exposed `to the to be ignited exteriorly oi' 'Seid plug to provide :i spark gap therebetween, e bored, insulating core having a Well interposed between seid ignition end and the Well of Seid eliell or jiecli'et, end en intermediate electrode, also exposed to the gases to lie ignited', and liiiving its ende it opposite Sidesl of seid Wella :i longitudinally bored core lievin; open to tlie gases on tlie exterior of end ii metellie Shell or jacket core ie heid end trein e porti n of i ie spaced to provide :i speri :initd core and jacket, of finieving its ignition end spec ,unetlier sp: lr

3. ln e, spiii'lr plug., tile combination with Seid core to piovn in tlie core, und en which bridges; the c gen seid ignition end and jee tlie combination with :in insulating core il ling un enleil nt its uition end iv .e3 open to tlie ex terior ol Seid plug end provides e space, it e Single binding-post electrode die linvingr e puit ,in seid mee funi eneeed "t ltr-oen the Wells thereof, :i metallic inclini; :tor Seid Ll, in i Spark plug,

core hei/ine; :i port thereof spaced i'ioni Suid "tre, and ai rivet und tile l trede ivliicii pier i provides two spari gaps between .en id ferrie l loerd ieri nii

' u conducting jacket and mi insulating core With'n space therewithin that is open to the exterior of the ping, of an electrode spaced apartiram the Walls of said spinge, an e1ectrede mi said 'jseket also spaced apart from sind walls, and an intermediate electrode which passes through said Walls to form anA 10 exposed spark in said space Within the core and another spark on the exterior of said core.

n. testimony whereof We have hereunto lsigned our names.

JOHN L. NILSO. JOHN PRINCE. 

